I'm working on an Oracle 11g database, and simply need to create a user and log in with it. I successfully create the user, but after running the second line below, I still can't log in. Is there something I'm missing?

If you used double quotes to create the user and give the password, then case becomes significant. I don't have an 11g DB here, but 10g allows me to create a user in lower case, and then I'm stuck using double quotes to log in with: